For what its worth, there's controller support on Stadia in the early access version. It works ok, especially walking around is better than mouse+kb . It is a bit spotty with selecting things in the world, but right now even with mouse it is spotty. I am not particular fan of how many button presses it takes to do certain actions, i.e. to jump or cast a spell, depending on which bar these are located it might need you to go through multiple bars to get to it ). But overall it works right now.
